SSL-Tools

SSL check results of isprz.com

NEW You can also bulk check multiple servers.

Discover if the mail servers for isprz.com can be reached through a secure connection.

To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate, support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack. Futhermore we recommend using end-to-end encryption with GnuPG.

Summary

JSON Refresh

Report created Wed, 25 Jun 2025 16:34:05 +0000

We can not guarantee a secure connection to the mailservers of isprz.com!

Please contact the operator of isprz.com and ask him or her to solve this problem. This result stays accessible under the following address:

/mailservers/isprz.com

Servers

Incoming Mails

These servers are responsible for incoming mails to @isprz.com addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
dd1go.de
2a02:180:2:41::d
Results incomplete
10 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
dd1go.de
81.7.11.28
 10
supported
jena221.isprz.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
2 s
retevis.org
2a02:180:2:41::2
Results incomplete
10 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
retevis.org
81.7.11.33
 10
supported
jena221.isprz.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s
mail.isprz.com
81.7.14.174
 10
supported
jena174.isprz.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s
mail.isprz.com
81.7.11.39
 10
supported
jena174.isprz.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
2 s
mail.isprz.com
81.7.14.145
 10
supported
jena174.isprz.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
2 s
isp-korte.de
2a02:180:2:c9::1
Results incomplete
10 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
isp-korte.de
81.7.11.44
 10
supported
jena174.isprz.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s
retevis.info
2a02:180:2:41::2
Results incomplete
10 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
retevis.info
81.7.11.33
 10
supported
jena221.isprz.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s

Outgoing Mails

We have not received any emails from a @isprz.com address so far. Test mail delivery

Certificates

First seen at:

CN=jena221.isprz.com

Certificate chain
  • jena221.isprz.com
    • remaining
    • 4096 bit
    • sha256WithRSAEncryption
    • Hostname Mismatch
      • R11
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • jena221.isprz.com
Alternative Names
  • jena221.isprz.com
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R11
validity period
Not valid before
2025-06-10
Not valid after
2025-09-08
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
60:19:41:89:C1:93:9C:C9:23:FC:12:2D:3E:7A:C7:48:24:54:21:77:FF:4B:A0:06:1C:A4:8F:13:3C:47:A8:00
SHA1
DF:37:EF:37:48:3B:C9:7F:D8:4F:0B:6D:5A:13:0B:27:78:5C:23:A1
X509v3 extensions
subjectKeyIdentifier
  • 45:6F:2D:55:03:3C:B0:97:DA:8C:5D:2E:9A:00:96:47:36:0D:74:C5
authorityKeyIdentifier
  • keyid:C5:CF:46:A4:EA:F4:C3:C0:7A:6C:95:C4:2D:B0:5E:92:2F:26:E3:B9
authorityInfoAccess
  • CA Issuers - URI:http://r11.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r11.c.lencr.org/124.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 0D:E1:F2:30:2B:D3:0D:C1:40:62:12:09:EA:55:2E:FC:
  • 47:74:7C:B1:D7:E9:30:EF:0E:42:1E:B4:7E:4E:AA:34
  • Timestamp : Jun 10 06:53:51.081 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:CD:C1:4D:B3:B6:9F:18:BF:4F:96:AC:
  • 93:DC:69:A5:A1:17:70:F7:7E:01:84:60:5F:66:F6:3F:
  • 81:56:09:2D:6F:02:21:00:CB:D6:20:D1:BB:87:1E:83:
  • 76:3E:A7:5B:A9:24:62:51:E8:67:C5:C4:36:C0:5C:2B:
  • FD:31:2C:59:2F:86:A9:E5
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : CC:FB:0F:6A:85:71:09:65:FE:95:9B:53:CE:E9:B2:7C:
  • 22:E9:85:5C:0D:97:8D:B6:A9:7E:54:C0:FE:4C:0D:B0
  • Timestamp : Jun 10 06:53:53.099 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:CD:BD:12:10:32:E1:F4:69:AA:53:E6:
  • 6E:D0:86:41:50:67:4C:43:6E:B4:B4:3C:08:8C:F4:FE:
  • 85:67:39:89:01:02:21:00:B2:BD:31:CA:99:21:74:6A:
  • BC:FC:52:29:1E:67:56:5C:64:21:B7:0D:E4:E2:5E:08:
  • 17:D8:E9:7A:1B:1D:BE:95
First seen at:

CN=jena174.isprz.com

Certificate chain
  • jena174.isprz.com
    • remaining
    • 4096 bit
    • sha256WithRSAEncryption
    • Hostname Mismatch
      • R10
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • jena174.isprz.com
Alternative Names
  • jena174.isprz.com
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R10
validity period
Not valid before
2025-05-27
Not valid after
2025-08-25
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
72:6F:D4:EC:7E:5C:1D:20:F5:08:50:C9:BB:4C:38:93:54:69:04:C2:96:0F:8B:25:87:3A:2F:F6:FB:7D:BD:FA
SHA1
0F:50:36:8D:02:1E:38:69:CD:B3:45:69:EC:0A:7A:A6:9A:84:5F:DA
X509v3 extensions
subjectKeyIdentifier
  • 2A:13:9E:75:85:18:BF:9E:BE:E6:68:7C:7C:D8:F1:A3:C3:CA:D9:69
authorityKeyIdentifier
  • keyid:BB:BC:C3:47:A5:E4:BC:A9:C6:C3:A4:72:0C:10:8D:A2:35:E1:C8:E8
authorityInfoAccess
  • CA Issuers - URI:http://r10.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r10.c.lencr.org/71.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 0D:E1:F2:30:2B:D3:0D:C1:40:62:12:09:EA:55:2E:FC:
  • 47:74:7C:B1:D7:E9:30:EF:0E:42:1E:B4:7E:4E:AA:34
  • Timestamp : May 27 07:07:12.995 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:0B:26:8E:CC:DD:AC:47:D7:C0:EB:F0:81:
  • 38:27:BD:21:B3:BF:22:F3:94:B9:E8:D1:B7:5A:A2:08:
  • 5C:14:1E:74:02:20:7F:69:4B:A5:8B:33:C3:2F:FB:2D:
  • 31:3A:68:D1:FE:D2:02:AB:A6:8E:FF:7A:2E:6D:97:DD:
  • C2:32:D0:6A:D3:39
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 12:F1:4E:34:BD:53:72:4C:84:06:19:C3:8F:3F:7A:13:
  • F8:E7:B5:62:87:88:9C:6D:30:05:84:EB:E5:86:26:3A
  • Timestamp : May 27 07:07:16.990 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:23:48:73:B9:F2:D1:B7:55:E4:3E:AF:C7:
  • 8D:9D:A6:4F:8B:2B:FF:D1:39:E4:18:EA:E2:BE:30:D7:
  • 87:9F:19:71:02:21:00:BA:D3:71:52:67:A9:66:6A:50:
  • 2A:05:F4:01:5D:FA:93:06:F0:CE:9B:F0:26:59:93:87:
  • 55:0A:42:1A:30:DC:F4